I'm using Blender 2.63a on a Imac using 10.6.8 system software. I'm having problems getting my user preferences window to show up. I select it in the drop down menu and nothing happens. Also when I use the scroll wheel on the mouse to zoom in on an item the zoom slows as I get closer and then stops completely. I'm not sure what's happening here. The scroll wheel does work fine with an earlier version of blender 2.6.